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    <title>Document</title>
    <script>
        // function Person(name,age,gender){
        //     this.name = name ;
        //     this.age = age ;
        //     this.gender = gender;
        // }
        // Person.prototype.sayName = function(){
        //     console.log(this.name)
        // }
        // var per = new Person('suliang',21,'男');
        // console.log('name' in per); //true
        // console.log('sayName' in per);  //true 
        
        // console.log(per.hasOwnProperty('sayName'));
        // console.log(per.__proto__.hasOwnProperty('sayName'));

        
        
        
    </script>
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